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Financing Arrangements - Additional Information (Details) € in Millions	9 Months Ended
	Feb. 28, 2025 USD ($) AirCraft	Feb. 28, 2025 EUR (€) AirCraft	Jan. 07, 2025 USD ($)	May 31, 2024 USD ($)
Line Of Credit Facility [Line Items]
Debt instrument, face amount	$ 10,700,000,000	€ 940
Debt exchange offers principal offered			$ 16,200,000,000
Number of Boeing aircraft | AirCraft	19	19
Net book value of Boeing aircraft	$ 1,600,000,000
Financial covenant terms ratio	3.50%	3.50%
Financial covenant compliance ratio	1.80%	1.80%
Long term debt, including current maturities and exclusive of finance leases carrying value	$ 19,600,000,000			$ 19,800,000,000
Long term debt, including current maturities and exclusive of finance leases fair value	$ 17,500,000,000			$ 17,500,000,000
Long-term debt weighted-average interest rate	3.50%	3.50%
Senior notes outstanding	$ 15,900,000,000
Three Year Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, term	3 years
Line of credit facility maximum borrowing capacity	$ 1,750,000,000
Line of credit facility, expiration date	2027-03
Letter of credit maximum sublimit amount	$ 125,000,000
Five-Year Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of credit facility, term	5 years
Line of credit facility maximum borrowing capacity	$ 1,750,000,000
Line of credit facility, expiration date	2029-03
Letter of credit maximum sublimit amount	$ 125,000,000
Credit Agreements [Member]
Line Of Credit Facility [Line Items]
Line of credit outstanding	0
Commercial paper outstanding	0
Letter of credit outstanding sublimit unused amount	250,000,000
1.875% due in February 2034 [Member]
Line Of Credit Facility [Line Items]
Debt instrument, face amount	$ 970,000,000
Fixed interest rate	1.875%	1.875%
Debt instrument, maturity date	2034-02

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Amount of principal amended in debt exchange.

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Amount of principal validly tendered for exchange and consent solicitations.

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Debt instrument, maturity month and year.

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Debt divided by adjusted EBITDA required by the financial covenant.

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Letter of credit maximum sublimit amount.

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Line of credit facility, expiration month and year.

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Long term debt including current maturities.

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Long term debt including current maturities fair value.

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Net book valve of collateralized Boeing aircraft.

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Number of Boeing aircraft to secure EETC notes.

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Carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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Face (par) amount of debt instrument at time of issuance.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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